Post-type arc-lamp.



F. H. MILLER. POST TYPE ARC LAMP.

APPLICATION FILED NOV. 28, ISIS.

mwmwu Patented Dec. 12, 1916.

INVENTOR ATTORNEY FREDERICK I-I. MILLER, 0F WILKINSBURG, PENNSYLVANIA,ASSIGNO R TO WESTING- HOUSE ELECTRIC AND MANUFACTURING COMPANY, ACORPORATION OF PENNSYL- VANIA.

Specification of Letters Patent.

ros'r-rYrE ARC-LAMP.

Patented Dec. 12, 19116.

To all whom it may concern Be it known that I, FREDERICK H. MIL- mm, acitizen ofthe United States, and a resident of Wilkinsburg, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in Post-Type Arc-Lamps, of which the following is aspecification.

My invention relates to are lamps, and it has particular reference toare lamps of the inclosed type which are to be mounted upon posts orpedestals.

Heretofore, it has been diflicult to design an inclosed arc lamp forpost mounting which would be simple in construction and would permit ofexpeditiously making 1nspections and, at the same time, preclude theinflow of water to the lamps structure when subjected to severe weatherconditions.

One object of my invention is to provide an inclosed arc lamp for postmounting which will be weather-proof, and, in addition thereto, will besimple and inexpensive to construct.

Another object of my invention is to provide a lamp of the characterindicated above which will permit the necessary inspections andperiodical replacements to be made without undue annoyance or loss oftime to the inspector.

For a better understanding of the nature and the scope of my invention,reference may be had to the following description and theaccompanyingdrawing wherein is disclosed one embodiment of my'invention.

In the drawing, Figure 1 is a view, partially in section and partiallyin elevation, of an arc lamp constructed in accordance with myinvention; Fig. 2 is a side view of an outer globe for my arc lamp; Fig.3 is a View, taken on the line III-III of Fig. 1; Fig. 4: is across-sectional view of a device utilized in my invention; Fig. 5 is aView, taken on the line VV of Fig. 1; Fig. 6 is a view, that is taken onthe line VIVI of Fig. 1 and shows a clamping means for the outer globeof my lamp, and Fig. 7 is a view, taken on the line VIIVII of Fig. 1 andshowing a hinge device associated with the outer globe shown in Fig. 1.

Referring to Fig. 1, a pair of cooperating electrodes or carbons 1 and 2are disposed in an arc chamber 3 provided by an inner globe 4 which isclosed at its bottom and communicates at its top with the chamber of acondenser 5. The feeding and regulating mechanisms (not shown) of thelamp are of any usual form of construction and are inclosed in thestructure 6 which is designed to preclude the admission of water intothe chamber of said structure and to permit adequate Ventilationthereof. A divided outer globe 7 substantially surrounds the inner globe4: and provides a dead air space 8 which maintains the walls of theinner globe 4 uniformly hot during the existence of the are: It isessential that the dead air space 8 be cut off from communication withthe chamber of the condenser 5 by an imperforate annular member 9 andalso it is essential, for the most satisfactory operation of the lamp,that the said air space be closed against the circulation therethroughof atmospheric air. As shown in the drawing, the lamp structure issupported upon a post or pedestal 10 by means of oppositely disposed andupwardly projecting arms 11 which are cast in the upper portion of thepost 10, and are firmly secured to the supporting annulus 9 of the lamp.

Inasmuch as it is necessary to remove the inner globe 4i when trimmingor replacing the burned carbons, and because the lamp cannot be readilydisengaged from the sup porting arms 11, I provide a means for access tothe inner globe 4 by employing a di vided outer globe 7. As shown inFigs. 1 and 2, the outer globe 7 is divided into halves, each of whichis attached to a hinge 12 secured to one of the arms 11. A clamp device13 is disposed opposite said hinge and normally maintains thecooperatively engaging edges of the halves of the globe 7 in closecontact with,each other.

In order to trim the lamp, a latch 14 of the clamp 13 is released from arecessed arm 15, thereby permitting the globe halves to be swung apart.Each half of said globe is swung upon the hinge 12, thus making theglobe 4 accessible. When the inner globe is detached from the lampstructure, its lower portion projects into a recess 16 formed in theupper portion of the post 10. In this manner, the inner globe 4 isinsured against injury and room is provided whereby the electrodes 1 and2 may be conveniently' removed and new electrodes inserted.

The divided globe 7 may be formed by cutting. a globe of ausual shapealong a plane through its vertical axis. Upon the cut edges of each halfof the globe 7 are spun or fitted metallic channeled rims 17 to .whichare rivited the cooperating members of the clamp 13, substantially asshown in Fig. 6. Referring to the hinge 12, illustrated in Figs. 2 and 7a support 18 thereof is riveted to the arm 11, the said support beingprovided with an opening through which a pin 19 loosely projects.Embracing each end of the pin 19 are two members 20 which encircle theshank of the said pin and are riveted to the metallic rims 17 embracingthe cut edges of the globe halves. I

The object of placing the metal rims l7 uponthe cooperatively engagededges of the globe halves is three fold, namely, to provide a supportingmeans for the clamp 13 andthe hinge 12, as mentioned above; to precludethe chipping of the glass by reinforcing the cut edges, and. to providea water-tight joint between the respective globe edges and lips ofthearms 11.

As illustrated in Figs. 3, 4 and 5, the arms 11 are provided withintegrally formed lips .21 'which are normally spaced apart as shown inF igL 4 by reason of the spring action imparted thereto by the slittubular arm 11. When the halves of the globe 7 are clamped together, themetallic rim 17 upon each globe half engages its respective lip 21,thereby forcing the-lips into engagement, as shown in Fig. 3. This formof construction provides a water-tight joint between the globe halveswhich precludes the flowing of water into the chamber 8 and the chamber16 located in the upper portion of the post 10.

It is apparent that a rain shield such as 22 will prevent water fromentering the chamber 8 at the upper edges of the halves of the globe 7.The lower edges of the globe halves encircle an upwardly projectingridge 23. The joints formed by pressing the metallic rims 17 firmlyagainst the lips 21, as described above, are sufiiciently tight to shedWater. Another advantage of my lamp structure is the employment of thearms 11 for both supporting the weight of the lamp proper and forenhancing the effectiveness of the joints between the globe halves byreason of the spring action imparted thereby to the lips 21. Although aportion of light flux from the arc is intercepted by the arms 11, theyare not of sufficlent diameter to cast undesirable and dis agreeableshadows.

Byreason of my invention, I may also employ acondenser having walls thatextend laterally beyond the globe 7, which type of condenser ispreferred because of its high heat-radiating capacity. No inconveniencewill result in the use of a condenser such as shown, inasmuch as theouter globe 7 is positioned to surround the inner globe 4 without havingto pass the outer globe over the condenser, as is necessary in lamps ofthis type heretofore constructed.

While I have herein shown and described one embodiment of my invention,it will be understood by anyone skilled in the art that variousmodifications may be efiected without departing from the scope of theappended claims.

I claim as my invention:

1. The combination with a pedestal, and arms projecting therefrom, of anarc lamp supported on said arms, an inner globe attached to said arelamp, and a divided outer globe disposed upon the pedestal and providinga dead air space which substantially surrounds the said inner globe, thesections comprising the divided outer globe closely engaging said armswhich serve to provide tight joints between the respective globesections. 7

2. The combination with a pedestal, and arms secured thereto, of an arclamp which is supported upon said arms, an inner globe closed at itsbottom and removably attached to the lamp, and an outer globe open atits top and bottom and comprising a plurality of sections closelyengaging said arms which serve to provide tight joints between therespective globe sections, said outer globe normally engaging, at itsupper end, the structure of the lamp, and at its lower end, thepedestal, in order to provide a dead air space around the inner globe.

3. The combination with a pedestal, and oppositely disposed and upwardlyprojecting arms secured thereto, of an arc lamp supported upon said armsand centrally disposed relative thereto, a removable closed inner globeattached to the lamp, a divided outer globe normally providing a deadair space which substantially surrounds the inner globe, the sections ofthe divided outer globe being hinged to one of said arms. and resilientmeans associated with said arms and engaging said globe sections whenthe globe sections are in operative position in order to provide tightjoints therebetween.

4:. The combination with a pedestal and communicating at its top withthe conmally engaging the lamp structure and the pedestal to provide adead air space which substantially surrounds the said inner globe andclosely engaging the lips formed on said arms to provide tight jointsbetween the globe sections.

5. In a post-type inclosed arc lamp, an upright pedestal, a pair ofoppositely disposed supporting arms secured thereto, resilient andspaced lips integrally formed and longitudinally disposed upon saidarms, an arc lamp supported upon said arms, an outer globe divided intotwo sections, each being hinged to one of said arms, metallic rimsembracing the cooperatively engaging edges of said sections, said globesections in operative position closely engaging said lips of thesupporting arms, thereby providing Water tight joints between the saidglobe sections.

In testimony whereof, I have hereunto subscribed my name this 25th dayof Nov.,

FREDERICK H. MILLER. Witnesses:

B. B. Hmns, M. O. MERZ.

t'l'opies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents, Washington, D. G.

